Write debug build commands in a generalized way (without any specific version number)

[eemihauk]

The documentation fix #23 is valid for just the current version of the app. There should be a command written without any specific version number, e.g.

$ adb install -r App/build/outputs/apk/lokki-v[VERSION_NUMBER]-debug.apk

Maybe then also leave an example with a concrete version number?
It would also probably be good to add how to find the version number of the build.

[akiratk0355]

It would be better. And also adding a link to the latest release would make it easy. For example:

Check the latest release version number here

Then we don't need to refresh version info anymore.

[eemihauk]

Yes, I just added the releases link to the main lokki repo wiki. Adding it to the lokki-android repo README would also be good.

[eemihauk]

Solved in #25